Part I. Molecular theory of damping in fibers (I) vibrational study of Saran in fibets Part II. Molecular theory of damping in fibers (II) temperature effect on the energy loss in Sarn Part III. Stress relaxation and shrinkage in fibers

During the last decade, many papers and patent claims have appeared on polyvinylidene chloride plastics. The latter is widely known now as "Saran'" (a trade name of the Dow Chemical Company). A general survey on this plastic is given in the papers of W. C. Goggin and R. D. Lowry(Q and J􁪽'J.: P. Staudinger. (􁪽 By the method of x-ray diffraction (1.2.3.4) the structure of Saran has been clarified a great deal, and its outstanding chemical and physical properties have been related to its structure. The present work was undertaken to study the structure and the properties of Saran fibers from a rather different direction. t. e., energy loss or internal friction accompanying the longitudinal vibration of the fibers.